They came straight from a S. American lake or river to your doorstep? Any plans on what are you going to feed them? It may be difficult.
F0's are great for bringing new genes into the hobby but F1's are a lot easier to take care of. The Festae in my avatar is bred from an F0 male and F1 female.
they are currently eating frozen bloodworms and frozen brine. i also have them picking at dainichi pellets, niot quite eating them yet, but its only been a day.